Not necessarily. But quality of life is a big factor. My Boo is a senior kitty with progressing kidney issues and he has lost a significant amount of weight in the past year. Some days he eats better than others, but he is still eating and still gets spurts of energy and greets me at the door when I get home from work. If your kitty is still doing many of the things he likes, then he may still have some time left. Is he displaying other "symptoms" besides weight loss?Does anyone know if a cat with kidney disease who is losing weight is in pain?